linux-kernel - Re: [PATCH 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

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Message-ID: <20181109065226.GB20049@tiger>
Date:   Fri, 9 Nov 2018 14:52:28 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Sriharsha Allenki <sallenki@...eaurora.org>,
        Anu Ramanathan <anur@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

On Fri, Nov 09, 2018 at 10:52:17AM +0530, Vinod Koul wrote:
> On 08-11-18, 15:04, Shawn Guo wrote:
> > +static int qcom_snps_hsphy_config_regulators(struct hsphy_priv *priv, int high)
> > +{
> > +	int min, ret, i;
> > +
> > +	min = high ? 1 : 0; /* low or none? */
> > +
> > +	for (i = 0; i < VREG_NUM; i++) {
> > +		ret = regulator_set_voltage(priv->vregs[i].consumer,
> > +					    priv->voltages[i][min],
> > +					    priv->voltages[i][VOL_MAX]);
> > +		if (ret)
> > +			return ret;
> 
> should we not roll back the set voltages on error?

Yes.  I will get that handled in v2.  Thanks.

> 
> > +static int qcom_snps_hsphy_por_reset(struct hsphy_priv *priv)
> > +{
> > +	int ret;
> > +
> > +	ret = reset_control_assert(priv->por_reset);
> > +	if (ret)
> > +		return ret;
> > +
> > +	/*
> > +	 * The Femto PHY is POR reset in the following scenarios.
> 
> POR?

Hmm, I do not understand this comment.  The POR is commonly used as the
abbrev of power-on-reset.  What do you meat exactly?

> 
> > +static int qcom_snps_hsphy_init(struct phy *phy)
> > +{
> > +	struct hsphy_priv *priv = phy_get_drvdata(phy);
> > +	int state;
> > +	int ret;
> 
> perhaps they can be in a single line :)

I prefer to keep them on separate line, as that makes the addition and
removal of one of them relatively easier.

> 
> > +static int qcom_snps_hsphy_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct phy_provider *provider;
> > +	struct hsphy_priv *priv;
> > +	struct resource *res;
> > +	struct phy *phy;
> > +	int size;
> > +	int ret;
> > +	int i;
> > +
> > +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return -ENOMEM;
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	priv->base = devm_ioremap_resource(dev, res);
> > +	if (IS_ERR(priv->base))
> > +		return PTR_ERR(priv->base);
> > +
> > +	priv->num_clks = ARRAY_SIZE(qcom_snps_hsphy_clks);
> > +	priv->clks = devm_kcalloc(dev, priv->num_clks, sizeof(*priv->clks),
> > +				  GFP_KERNEL);
> > +	if (!priv->clks)
> > +		return -ENOMEM;
> > +
> > +	for (i = 0; i < priv->num_clks; i++)
> > +		priv->clks[i].id = qcom_snps_hsphy_clks[i];
> > +
> > +	ret = devm_clk_bulk_get(dev, priv->num_clks, priv->clks);
> > +	if (ret)
> > +		return ret;
> > +
> > +	priv->phy_reset = devm_reset_control_get(dev, "phy");
> > +	if (IS_ERR(priv->phy_reset))
> > +		return PTR_ERR(priv->phy_reset);
> > +
> > +	priv->por_reset = devm_reset_control_get(dev, "por");
> > +	if (IS_ERR(priv->por_reset))
> > +		return PTR_ERR(priv->por_reset);
> > +
> > +	priv->vregs[VDD].supply = "vdd";
> > +	priv->vregs[VDDA_1P8].supply = "vdda1p8";
> > +	priv->vregs[VDDA_3P3].supply = "vdda3p3";
> > +
> > +	ret = devm_regulator_bulk_get(dev, VREG_NUM, priv->vregs);
> > +	if (ret)
> > +		return ret;
> > +
> > +	priv->voltages[VDDA_1P8][VOL_NONE] = 0;
> > +	priv->voltages[VDDA_1P8][VOL_MIN] = 1800000;
> > +	priv->voltages[VDDA_1P8][VOL_MAX] = 1800000;
> > +
> > +	priv->voltages[VDDA_3P3][VOL_NONE] = 0;
> > +	priv->voltages[VDDA_3P3][VOL_MIN] = 3050000;
> > +	priv->voltages[VDDA_3P3][VOL_MAX] = 3300000;
> > +
> > +	ret = of_property_read_u32_array(dev->of_node, "qcom,vdd-voltage-level",
> > +					 priv->voltages[VDD], VOL_NUM);
> > +	if (ret) {
> > +		dev_err(dev, "failed to read qcom,vdd-voltage-level\n");
> > +		return ret;
> > +	}
> > +
> > +	size = of_property_count_u32_elems(dev->of_node, "qcom,init-seq");
> > +	if (size < 0)
> > +		size = 0;
> > +
> > +	priv->init_seq = devm_kcalloc(dev, (size / 3) + 1,
> 
> size/3? I think it would be good to add a common explaining this

The property is a sequence of <offset value delay> tuples, and we are
figuring out how many tuples are there.  Yep, I will add a comment in
there for v2.

Shawn